America Ferrera and her husband Ryan Piers Williams announced on Tuesday that they have welcomed their son, Sebastian, into the world. (Andrew H. Walker/Getty Images for the 2014 Tribec)

The baby's sex had not been previously released.

Ferrera and Williams — who were married in June, 2011 — celebrated their son's soon-to-be arrival with a baby shower in Los Angeles in March, surrounded by family, friends and her "Ugly Betty" costars.

The "Superstore" star first shared the news that she was expecting on New Year's Eve in an Instagram post that featured "2018" party glasses and a onesie.

"We're welcoming one more face to kiss in 2018!" Ferrera captioned the snap.